Talk:Prismatic compound of prisms

redundancy
If n and p are not relatively prime, there's a coincidence, no? —Tamfang (talk) 19:47, 6 September 2009 (UTC)
 * No, for example two square prisms (cubes), in which n=2, p=4, q=1: this still has symmetry Dnph=D8h. However, a coincidence DOES occur if p and q are not relatively prime. I've added a clarification to cover that case in this and related articles, i.e. ensuring that the representation p/q is in a fully reduced form. Robert Stanforth (talk) 21:29, 6 September 2009 (UTC)


 * Ah, I read into it something about the angle of rotation that wasn't there. —Tamfang (talk) 05:18, 7 September 2009 (UTC)